<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap 101 Template</title>

    <link href="static/css/bootstrap.min.css" rel="stylesheet">

    <script src="static/js/jquery-3.5.1.js"></script>
    <script src="static/js/bootstrap.min.js"></script>
</head>
<body>

<!-- 导航条 navbar-inverse 反色-->
<nav class="navbar navbar-inverse">
    <div class="container-fluid">
        <!-- 导航图标及汉堡按钮 -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
                    data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <!-- sr-only:盲人阅读器专用样式 -->
                <span class="sr-only">这是汉堡按钮</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">首页</a>
        </div>

        <!-- 导航的主体部分 -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">手机数码<span class="sr-only">盲人用：手机数码</span></a></li>
                <li><a href="#">电脑办公</a></li>
                <!-- dropdown 下拉菜单 -->
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                       aria-expanded="false">更多 <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">选项1</a></li>
                        <li><a href="#">选项2</a></li>
                        <li><a href="#">选项3</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">选项4</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">选项5</a></li>
                    </ul>
                </li>
            </ul>
            <!-- navbar-left 靠左 -->
            <form class="navbar-form navbar-right">
                <div class="form-group">
                    <input type="text" class="form-control" placeholder="Search">
                </div>
                <button type="submit" class="btn btn-default">Submit</button>
            </form>
            <!-- navbar-right 靠右 -->
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Link</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true"
                       aria-expanded="false">Dropdown <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li><a href="#">Something else here</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">Separated link</a></li>
                    </ul>
                </li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

</body>
</html>